Ho un calcolo molto semplice che produce lettere matrici trova probabilmente tutte le parole nella matrice. Le lettere nella parola sono celle adiacenti.Come tracciare e prevenire il deadlock apparso in c3po che è in esecuzione in processi separati?
for (int i = 0; i < 500; i++) {
System.out.println(i);
Matrix matrix = new Matrix(4);
matrix.scanWordsRandomly(9);
matrix.printMatrix();
System.out.println(matrix.getSollSize());
matrix.write_to_db();
}
Ecco il codice persistente.
public void write_to_db() {
Session session = null;
try {
session = HibernateUtil.getSessionFactory().openSession();
session.beginTransaction();
Matrixtr onematrixtr = new Matrixtr();
onematrixtr.setDimension(dimension);
onematrixtr.setMatrixstr(this.toString());
onematrixtr.setSolsize(getSollSize());
session.save(onematrixtr);
for (Map.Entry<Kelimetr, List<Cell>> sollution : sollutions.entrySet()) {
Kelimetr kelimetr = sollution.getKey();
List<Cell> solpath = sollution.getValue();
Solstr onesol = new Solstr();
onesol.setKelimetr(kelimetr);
onesol.setMatrixtr(onematrixtr);
onesol.setSoltext(solpath.toString().replace("[", "").replace("]", "").replace("true", "").replace("false", ""));
session.save(onesol);
}
session.getTransaction().commit();
session.close();
}
catch (HibernateException he) {
System.out.println("DB Error : " + he.getMessage());
session.close();
}
catch (Exception ex) {
System.out.println("General Error : " + ex.getMessage());
}
}
Questo è il file di configurazione di ibernazione.
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/kelimegame_db_dev?autoReconnect=true&useUnicode=true&characterEncoding=UTF-8</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">!.Wlu9RrCA</property>
<property name="hibernate.show_sql">false</property>
<property name="hibernate.query.factory_class">org.hibernate.hql.classic.ClassicQueryTranslatorFactory</property>
<property name="hibernate.format_sql">false</property>
<!-- Use the C3P0 connection pool provider -->
<property name="hibernate.c3p0.acquire_increment">50</property>
<property name="hibernate.c3p0.min_size">10</property>
<property name="hibernate.c3p0.max_size">100</property>
<property name="hibernate.c3p0.timeout">300</property>
<property name="hibernate.c3p0.max_statements">5</property>
<property name="hibernate.c3p0.idle_test_period">3000</property>
<mapping resource="kelimegame/entity/Progress.hbm.xml"/>
<mapping resource="kelimegame/entity/Solstr.hbm.xml"/>
<mapping resource="kelimegame/entity/Kelimetr.hbm.xml"/>
<mapping resource="kelimegame/entity/User.hbm.xml"/>
<mapping resource="kelimegame/entity/Achievement.hbm.xml"/>
<mapping resource="kelimegame/entity/Matrixtr.hbm.xml"/>
</session-factory>
</hibernate-configuration>
Dopo aver trovato tutte le possibili soluzioni, continuo la matrice e le soluzioni utilizzando l'ibernazione. Sto anche usando la libreria c3pO. Non sto generando alcun thread. Tutto il lavoro viene svolto in un modo iterativo molto semplice. Ma sto eseguendo il barattolo in processi separati. Da diversi terminali sto eseguendo questo:
java -jar NewDB.jar
ho avuto una situazione di stallo come segue:
Apr 25, 2013 8:38:05 PM com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector run
WARNING: com[email protected]7f0c09f9 -- APPARENT DEADLOCK!!! Creating emergency threads for unassigned pending tasks!
Apr 25, 2013 9:08:23 PM com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector run
WARNING: com[email protected]7f0c09f9 -- APPARENT DEADLOCK!!! Complete Status:
Managed Threads: 3
Active Threads: 3
Active Tasks:
com[email protected]2933f261
on thread: C3P0PooledConnectionPoolManager[identityToken->z8kfsx8uibeyqevbbapc|4045cf35]-HelperThread-#1
com[email protected]116dd369
on thread: C3P0PooledConnectionPoolManager[identityToken->z8kfsx8uibeyqevbbapc|4045cf35]-HelperThread-#0
com[email protected]41529b6f
on thread: C3P0PooledConnectionPoolManager[identityToken->z8kfsx8uibeyqevbbapc|4045cf35]-HelperThread-#2
Pending Tasks:
com[email protected]165ab5ea
com[email protected]1d5d211d
com[email protected]4d2905fa
Pool thread stack traces:
Thread[C3P0PooledConnectionPoolManager[identityToken->z8kfsx8uibeyqevbbapc|4045cf35]-HelperThread-#1,5,main]
com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:662)
Thread[C3P0PooledConnectionPoolManager[identityToken->z8kfsx8uibeyqevbbapc|4045cf35]-HelperThread-#0,5,main]
com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:662)
Thread[C3P0PooledConnectionPoolManager[identityToken->z8kfsx8uibeyqevbbapc|4045cf35]-HelperThread-#2,5,main]
com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:662)
Apr 25, 2013 9:41:29 PM com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector run
WARNING: com[email protected]7f0c09f9 -- APPARENT DEADLOCK!!! Creating emergency threads for unassigned pending tasks!
Apr 25, 2013 9:55:18 PM com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector run
WARNING: com[email protected]7f0c09f9 -- APPARENT DEADLOCK!!! Complete Status:
Managed Threads: 3
Active Threads: 3
Active Tasks:
com[email protected]5a337b7d
on thread: C3P0PooledConnectionPoolManager[identityToken->z8kfsx8uibeyqevbbapc|4045cf35]-HelperThread-#0
com[email protected]69f079ce
on thread: C3P0PooledConnectionPoolManager[identityToken->z8kfsx8uibeyqevbbapc|4045cf35]-HelperThread-#1
com[email protected]2accf9b8
on thread: C3P0PooledConnectionPoolManager[identityToken->z8kfsx8uibeyqevbbapc|4045cf35]-HelperThread-#2
Pending Tasks:
com[email protected]771eb4fb
com[email protected]fc07d6
com[email protected]2266731b
com[email protected]740f0341
com[email protected]59edbee
com[email protected]78e924
com[email protected]2123aba
com[email protected]7acd8a65
Pool thread stack traces:
Thread[C3P0PooledConnectionPoolManager[identityToken->z8kfsx8uibeyqevbbapc|4045cf35]-HelperThread-#0,5,main]
java.text.NumberFormat.getInstance(NumberFormat.java:769)
java.text.NumberFormat.getInstance(NumberFormat.java:393)
java.text.MessageFormat.subformat(MessageFormat.java:1262)
java.text.MessageFormat.format(MessageFormat.java:860)
java.text.Format.format(Format.java:157)
java.text.MessageFormat.format(MessageFormat.java:836)
com.mysql.jdbc.Messages.getString(Messages.java:106)
com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:2552)
com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3002)
com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2991)
com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3532)
com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:943)
com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:4113)
com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1308)
com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2336)
com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2176)
com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2158)
com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:792)
com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
sun.reflect.GeneratedConstructorAccessor7.newInstance(Unknown Source)
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
java.lang.reflect.Constructor.newInstance(Constructor.java:525)
com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:381)
com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:305)
com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:134)
com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:183)
com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:172)
com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:188)Killed
[email protected]:~/NetBeansProjects/NewDB/dist$
La mia domanda è la seguente:
- Può questa situazione di stallo in c3po accadere dal momento che sto eseguendo il programma nei processi separati ?
- Devo utilizzare un processo e più thread all'interno di questo processo ?
- Come posso tracciare questo deadlock capirne la causa? C'è un modo per rintracciare più JVM causando deadlock?
stai utilizzando anche mcache, giusto? Posso dire dallo stacktrace qui: * com.mchange.v2.async * – Eugene
quale versione di c3p0 stai usando? – Eugene
c3p0-0.9.2 è la versione. – cgon